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Entering orbit…
Habitability
30/ 100
Extremely Harsh

Jupiter

0

Gas Giant

Magnetic FieldExtreme Activity
Why is this a Gas Giant?Your planet has 87.0% hydrogen and helium, combined with a mass of 316.0x Earth, which exceeds the gas giant threshold.
Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
Classification Criteria:
✓ Hydrogen + Helium: 87.0% (>60% required)✓ Mass: 316.0x Earth (>10x required)
Habitability ScoreExtremely Harsh
30
Contributing Factors
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
geology40
Extreme volcanic activity may be hazardous
rotation60
Fast rotation - strong global wind patterns and weather systems, but manageable
Organic Chemistry80
Core organic elements (CHNO) present
atmosphere30
Hydrogen-rich atmosphere typical of gas giants
temperature20
Very cold - water frozen, challenging for life
magnetic Field100
Magnetic field provides radiation protection

Physical Properties

Mass
316.00x Earth (1.89e+27 kg)
Radius
6.81x Earth (43,395 km)
This planet: 6.81× Earth radiusEarth: 1× (baseline)
Surface Gravity
6.81x Earth (66.8 m/s²)
Surface Temperature
122 K (-151 °C / -240 °F)
Rotation Period
9.0 hours/day (faster than Earth)
This planet: 9 h/dayEarth: 24 h/day

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
5.20 AU (778 million km)
Orbital Period
11.9 years

Atmosphere

Hydrogen and helium dominated with trace methane and ammonia

Elemental Composition

H - Hydrogen
55.0%
He - Helium
32.0%
O - Oxygen
5.0%

Surface Characteristics

No solid surface - thick gaseous envelope with possible rocky core deep within

Closest Real Exoplanet

HD 154345 b86% similar
Orbiting HD 154345
YoursHD 154345 b
Mass316.0 × Earth377.0 × Earth
Radius11.0 × Earth13.7 × Earth
Density (composition)1.30 g/cm³0.81 g/cm³
Temperature121.9 K119.0 K
Starlight received0.04 × Earth0.03 × Earth
Star temperature5,600 K5,468 K
Discovered 2006 via radial velocity · 60 light-years awaySource: NASA Exoplanet Archive
Surface views from three worlds: rocky ground under a ringed sky, a cloud deck, and a lit desert

New: Stand on Your World 🏔️

Every planet you build can now be seen from the ground. The terrain, the color of the sky, the weather and what hangs overhead are all read from the same numbers that shape the globe — so a thin-aired world gives you sunlit rock under a near-black sky crowded with stars, a runaway greenhouse seals you under an unbroken sulfur lid, and a gas giant leaves you in the cloud tops with nothing solid beneath you at all. If one of your moons wandered inside the Roche limit, what is left of it arcs overhead as rings.

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